Thermador Dishwasher E15: AquaStop Water Protection
Quick Answer
The E15 code on a Thermador dishwasher means the AquaStop flood protection system has activated because water leaked into the base pan. The float switch in the base detects standing water and immediately locks the machine. You cannot clear E15 by pressing any button - the base pan must be physically drained by tilting the machine 45 degrees forward, then you must find and fix the leak source.
Thermador dishwashers run on the Bosch platform, so E15 works the same way on both. Water gets into the base pan, a little polystyrene float pops up, and the machine shuts down hard. If you ignore it, you're risking real water damage to your cabinets and subfloor. Most of the time when I show up for one of these, it's the door gasket. That's the $25-40 fix. Sometimes it's the pump seal.
Phillips #2 screwdriver (for kick plate removal), Multimeter set to continuity mode
What Does the E15 Code Mean?
Here's the deal - water leaked somewhere it shouldn't have and pooled in the base tray under the tub. The AquaStop system did exactly what it was designed to do, it saved your floor. Now you've got two jobs: drain that base pan (which requires physically tilting the machine, not just pressing buttons) and track down where the water came from. Door gaskets are the number one culprit on machines over 5 years old. Parts run $25-60.
Most Likely Causes
Based on aggregated repair data, here is the probability breakdown for this error code:
Worn or cracked door gasket allowing water to drip into base40%
Leaking detergent dispenser seal24%
Failed pump seal causing water to escape into base14%
Cracked sump housing (rare)12%
Loose or cracked fill hose connection at the water inlet10%
Symptoms You May Notice
E15 shows up on the display and the machine stops dead, either mid-cycle or right at startup.
All the indicator lights start flashing at once, looks alarming but it's just the AquaStop telling you what happened.
You press every button on the control panel and absolutely nothing happens, the machine is fully locked out.
There's water pooling on the floor under or in front of the dishwasher - sometimes you catch this before E15 even shows up on the display.
Machine stops partway through a cycle and won't restart even after you open and close the door and wait a few minutes.
Can you reset a Thermador dishwasher to clear the E15 code?
E15 won't clear from any button combination, that's by design. You have to physically drain the base pan by unplugging the machine and tilting it 45 degrees forward for 30-60 seconds. Once the float drops back down and the pan is completely dry, plug it back in and E15 clears on its own. If it comes right back when you power on, the base pan still has water in it or the leak is actively running again.
Tools Required for Diagnosis
Phillips #2 screwdriver (for kick plate removal)Multimeter set to continuity modeFlashlight or headlampAt least 4-6 large towels for base pan drainageBucket or shallow pan for overflowDry cloth or paper towels for base pan wipe-down
Diagnostic Checklist
Follow these steps in order. We start with the easiest external fixes before opening up the machine.
ComponentComponent Under Test
Expected Range0–2 ohms
ConditionIf Open (OL) or infinite, replace component.
Replacement Parts
If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.
Part Name
OEM Number
Estimated Price
Door gasket / door seal11016727 · $18–$35
11016727
$18 – $35
Base tray float switch00187197 · $12–$25
00187197
$12 – $25
Frequently Asked Questions
Can I reset Thermador E15 by unplugging the dishwasher?
Nope. Unplugging doesn't do anything because that float switch in the base pan is still physically sitting in the up position - it doesn't care if the power's off. The machine reads the switch state the moment you plug it back in and E15 comes right back. You've got to tilt the machine to drain the water, get that float to drop back down, and then make sure the base pan is actually dry before you reconnect power. Some people tilt it, plug it back in 30 seconds later while the base is still damp, and wonder why E15 is still there. Give it 10 minutes to dry.
How do I drain the base pan on a Thermador dishwasher?
Unplug the machine first, no exceptions. Lay down a bunch of towels in front of it. If it's a built-in model, you'll probably need to unscrew the mounting brackets from under the counter and slide it out a foot or two before you can tilt it. Tip the whole machine toward you at about 45 degrees and hold it there for 30-60 seconds. Water will pour out the front bottom, sometimes more than half a gallon, so have extra towels or a shallow pan ready. Set it back down slowly and let the pan air dry before plugging back in.
How do I find the leak causing E15?
Pull the kick plate off and get a flashlight down there. Look for white crusty mineral trails or fresh wet spots - those tell you the water's path. The door gasket is number one on my list, especially the bottom corners where it cracks first. Pump seal is second, you can usually see a drip pattern coming from the center-back area underneath. Fill hose connection at the inlet valve is third, just wiggle it and see if it moves at all. Honestly the fastest way is to run a short cycle with the kick plate off and watch from below. The leak'll show up pretty quick once the water starts moving.
Is the Thermador E15 the same as Bosch E15?
Identical. Both brands come out of BSH Group and Thermador dishwashers are basically Bosch dishwashers with different exterior styling and controls. Same AquaStop design, same float switch, same E15 code, same fix. I've replaced door gaskets on Thermadors using Bosch-compatible parts and they fit fine. So if you're searching for repair info and can't find much on Thermador specifically, just search Bosch E15 and everything applies directly.
The E15 keeps coming back after I drained the base pan. What now?
That means water's still getting in there during operation. You've fixed the symptom but not the cause. You need to catch the leak in the act - run a cycle with the kick plate off and watch with a flashlight. Sometimes the leak only happens at a specific point in the cycle, like when the pump ramps up or when the dispenser pops open, so you might need to watch for 10-15 minutes. Check the door gasket under actual compression by closing the door on a piece of paper and seeing if it grips all the way around. Then check the pump seal and every hose connection you can reach.
How much does it cost to fix a Thermador E15 error?
Depends on the cause. Door gasket is $25-50 for the part and about an hour of your time. Pump seal runs $30-60 for the part but takes longer, maybe 1.5-2 hours if you haven't done it before. Float switch itself is only $15-25 and pretty simple to swap. If you call a tech, add $100-150 for the service call plus labor on top of parts. Worst case is a cracked sump housing, which can run $150-300 for the part alone and it's a big job. At that point on a machine over 8-10 years old, you're honestly weighing whether repair makes sense at all.